Pulling over device for shoes, particularly for a toe lasting machine



March 20, 1962 w sc NK 3,025,541

PULLING OVER DEVICE FOR SHOES, PARTICULARLY FOR A TOE LASTING MACHINEFiled Dec. 24. 1958 5 SheetsSheet 1 FIG 7 FIG 2 3E H 2 m @NQU 2H U FIG.3

/N VE N 70.9.

March 20, 1962 A. WEINSCHENK 3,025,541

PULLING OVER DEVICE FOR SHOES, PARTICULARLY FOR A TOE. LASTING MACHINEFiled Dec. 24, 1958 5 Sheets-Sheet 2 O 0 o 5 H s: 5T7; 14 H13: 1 37 \EE5 1'55 7 (5 as F 37 a J F/Q4 J INVENTOEI 5 4914x0 4? March 20, 1962Filed Dec.

PULLING OVER DEVICE FOR SHOES, PARTICULARLY A. WEINSCHENK FOR A TOELASTING MACHINE 5 Sheets-Sheet 3 N V E N 7 0R 191 0- t/i ra uZ March 20,1962 A. WEINSCHENK PULLING OVER DEVICE FOR SHOE S, PARTICULARLY FOR ATOE LASTING MACHINE 5 Sheets-Sheet 4 Filed Dec. 24. 1958 March 20, 1962WEINSCHENK 3,025,541

PULLING OVER VICE FOR SHOES, PARTICULARLY FOR A TOE. LASTING MACHINEFiled Dec, 24, 1958 5 Sheets-Sheet 5 United States Patent @hhce PatentedMar. 20, 1962 3,025,54l FULLING DEVECE FSR SHOES, PARTICU- EARLY FUR ATQE LASTING MACHENE Albert Weinschenlc, Seulherg (Taunus), Germany, as-

signor to Eugen G. Henlrel K.G., Frankfurt am Main,

Germany, a corporation of Germany Filed Bee. 24, 1958, Ser. No. 732,938Claims priority, application Germany Oct. 3, 1953 23 (Jlairns. (til.12-1ll.1)

In the known pulling over machines used in the shoe industry, the upperleather is generally grasped by two grippers and one toe gripper andpulled over. Thereby a relatively wide space is left free between thetoe grippers and the lateral grippers, which is, of course, detrimentalto a uniform pulling over of the upper. That is why the form of thegrippers was relatively wide and accord ing to the shape of the last,and why the grippers were drawn back to the vicinity to the lateralpincers in order to form a nearly closed gripper circle. But a uniformpull is not obtained, cited arrangement of the toe pincers, thicknessvaries as some models demand, or if there are seams on the front capslike, as in these cases the usual gripper construction cannot compensatethe unequalities and cannot hold the leather uniformly along its entirerim. The consequence is a non-uniform pulling over force resultinggenerally in many folds.

Further disadvantages of the pulling over machines as used up to nowconsist in the fact that a correcting of the toe part after the pullingover, is not or is only partly possible, and that, furthermore, whenusing eX- tremely different last shapes, the toe grippers must beinterchanged, which is of course complicated and SlOWs down theproduction if these changes have to be made often.

It is an object of the invention to eliminate the disadvantages of knownpulling over devices and the invention accomplishes this object by usingtwo pulling over grippers arranged adjacent to each other instead of theone toe gripper usual up to now for the toe point. The two grippers canbe adjusted and regulated independently of each other according to thedimension and the form of the shoe last. For the last cited purpose thetwo toe pincers can be pivoted, each one separately, by means of onepivoting segment in a horizontal plane around an inner gripper pointlying opposite the fore- .lOSt point of the shoe. Thus it becomespossible, as stated above, to adapt both toe grippers to every lastform, so that in each case the last i surrounded by a practically closedline of grippers. For the same purpose, i.e. for the adaption to thelast form and above all to the size of the last, both toe grippers arefurthermore arranged irl such a way, that they can be moved towards thepoint of the shoe or away from it and be adjusted and fixed in such aposition.

A further inventive feature consists in the fact that the basic positionof each toe gripper, i.e. their position relative to the lower rim ofthe lasting wiper can be regulated, for which purpose the height of eachone of the grippers can be adjusted. Furthermore, the lower parts of thegrippers are arranged in such a way, that they can be pivoted around abolt relative to the upper part of the grippers, whereby unequalthicknesses of leather can also be grasped uniformly. In order to beable to grasp a uniformly wide edge of the upper leather the upper partsof each toe gripper are provided with stop pins.

A further inventive idea consists in providing a correcting device forthe alignment of the pulled over upper leather front part, which devicecan be handled easily and surely in spite of the pulling forces. Thiscorrecting device comprises two independent levers under spring load, onwhich stop pins are provided, which act on the gripper holder in such amanner that each gripper can be adjusted in its height in closed stateand thus the forward point of the upper leather can be aligned at will.

The invention is to be elucidated further with reference to the drawingswhich illustrate an embodiment of the device according to the invention.

FIGS. 1 and 2 are diagrammatical plan-views of the arrangement ofgrippers as were usual up to now,

FIG. 3 is a diagrammatic view of the arrangement of the pincersaccording to the invention.

FIG. 4 shows the complete pulling over device in planview, partially insection.

FIG. 5 shows the complete toe lasting and glueing machine with a pullingover device according to the invention in side elevation, and

FIG. 6 is an elevation illustrating the gripper supporting and operatingpart of the machine on an enlarged scale.

FIG. 7 is a fragmentary schematic plan view illustrating the position ofthe toe grippers opposite the last.

FIG. 8 is a fragmentary side elevation, partly in section, illustratingthe gripper supporting and operating part of the machine on an enlargedscale.

FIG. 9 is a longitudinal sectional view of a control piston arrangementfor interrelating the operations of wiper means with the gripperoperation; and

FIG. 10 is a cross sectional view of a control valve used in the deviceof FIG. 9.

In the FIGURES 1 to 3 the last, which is surrounded in the usual mannerby the lateral pulling over grippers 2, is given the number 1. In FlGUREl one of the toe grippers 3 usual up to now is shown and in FIGURE 2atoe grippers 4, which is somewhat broader than the grippers 3 and isadapted to the shape of the last is shown. The deficiencies of these toegrippers 3 and 4 were already described hereinbefore. According to theinventionFlGURE 3two separate toe grippers 5 and 6, arranged adjacent toeach other, are provided, so that an almost completely closed grip lineof grippers is formed.

As shown in FIGS. 6 and 8, each of the two toe grippers consists of afixed upper jaw 7 and a movable lower jaw 8, which is adjustably fixedon a piston 9, operated hydraulically through the feed conduit it). Thegrippers are arranged on cylinder portions 11, which are fixed on segmeat-shaped supports 12, see \FIG. 5. This pivotable segment 12 isarranged on supporting means including a holder 14, which holder isfixed on a shaft 35. This shaft 15 can slide longitudinally in bearings17 of the machine frame 125, while guide bolts 15 prevent rotation ofthe shaft. Around the upper end portion of the shaft a spring H isarranged, which bears on the one side against the bearing 17 and on theother side against a flange 2%). On the lower shaft end a flange Zll isrigidly arranged, in which an adjusting screw 22 is arranged. whichabuts against the lower bearing 17. By means of this screw 22 the basicposition of the grippers, each of which is fixed to a shaft 15 by meansof the parts ll, 12 and 14, can be independently adjusted to the lastingwiper 23.

The pivoting segment 12, supporting cylinder portion 11 is arranged in aguide groove 24 (FIG. 4) of the holder 14 and can be shifted within theguide groove 24, so that the grippers can be pivoted around the adjacentpoints 25 in the direction of the arrows. Thus the grippers 5 and 6 canbe independently adapted in each single case to the shape of the last 1used. In order to fix the segment 12 in the necessary position the crosslever 27 is used. In FIGURE 4 the segments 12 and thus also the grippers5, 6 are represented in different positions.

In order to adjust the toe grippers 5 and 6 not only according to theshape of the last but also corresponding to the size of the last, theportion 11 of the grippers is arranged in such a way on a bolt 23 xed inthe pivotable segment 12, that the portion 11, together with thegrippers, can be pivoted towards the tip of the last or away from thesame, so that the distance of the toe pincers from the tip of the lastcan be regulated. This pivotal movement is executed. and adjusted bymeans of the screws 29 and 3%.

FIG. 6 and FIG. 8 show that the lower jaw 8 of the grippers is fixed tothe piston 9 by means of a turnable pivot pin 31, so that it is easilypivotable relative to the upper jaw of the grippers '7. This has theadvantage that, in grasping the edge of the upper leather, uneventhicknesses of the leather can be compensated for so that in case of notuniform leather thicknesses, the rim of the upper leather is graspeduniformly between the two gripper jaws.

On the upper part 7 of the grippers stop pins 32. are provided, whichengage with play into corresponding recesses 33 of the lower jaw 8 ofthe grippers. The play of stop pins 32 in the recesses 33 is suificientto permit the pivotal movement of jaw 8 relative to jaw 7. By these stoppins 32 an uniformly broad rim of the leather is grasped, so that thepulled over portion of the upper, and respectively the final permanentrim is uniform for each shoe.

FIG. 4 (and also FIGURE 5) shows a correcting device by which acorrection of the fit of the upper before cutting procedure is made.This correcting device consists of the stops 34 which are firmlyarranged on a shaft 35, journaled in the machine frame 18. At the otherend f this shaft 35 a lever 36 is fixed, which is provided with a stoppin 37 engaging into catch 38. if the grippers 5 and 6 have pulled overthe point of the uppers and a correction becomes necessary, the levers36 are disengaged (as shown in the right part of FIGURE 4) and arepressed downward or upward, so that the stops 34 in connection with theflange 21 either press the shaft downward or permit upward movement ofshaft 15 through the spring. The same movement is thereafter made by therespective grippers. In the necessary height the lever 36 are againengaged into the catch holes 38, whereafter the wiper means 23 areoperated. After this procedure all the different parts of the machineare returned to their initial position and this applies also to thecorrecting lever 36. This is done in such a way, that through theconduit 4% pressure oil flows into the cylinder in which pistons 41 arelocated, so that the pistons 41 are pressed outward, whereby also theshafts move outwardly, taking the levers 36 with them, so that theselatter are disengaged from the catch holes 38 and are drawn by thetension springs 42 into their uppermost normal position.

During the wiper operation, the grippers must of course be loosened, asis generally known, and in order to execute this procedure at the righttime in order to avoid the formation of folds in the lasted position ofthe upper, the opening of the grippers depends on the path of the wipers23. For this purpose a blocking valve 4-3 is provided, which iscontrolled by the piston 33 over a lever 44, a shaft and an adjustmentjaw 46. Cum lever 44 acts on a projecting pin 43 of valve 43 so that theflow of liquid to cylinders 11 is controlled by valve 43 to effectloosening of the grippers when piston 13 is in a position in which thewiper is operative. Movement of shaft 45 with piston 13 will turn lever44- to operate valve 4-3.

The above described embodiment proves that the toe grippers according tothe invention by their many different adjusting and regulatingpossibilities, fulfill every requisite necessary for a perfect pullingover of the upper and for obtaining a uniform, foldless pulled rim ofthe upper, which is the presupposition for a perfect lasting.

What I claim as my invention is:

1. Apparatus for pulling an upper over a last, com

prising, in combination, a pair of grippers having adjacent end pointslocated in the region of the forward tip of the last and other endpoints adapted to be located laterally of the fore part of the last; apair of supports supporting said grippers for turning movement aboutaxes passing through said adjacent end points, respectively; a pair ofsupporting means respectively supporting said pair of supports, and eachsupporting means including means for adjusting in the direction of saidaxes the positions of said grippers relative to the last; and means forturning said grippers on said supports independently of each other tooperative positions in which said other end points are adapted to belocated adjacent other lateral grippers to form with the same asubstantially continuous grip line surrounding the fore part of thelast, whereby said grippers are adapted to pull an upper along saidcontinuous grip line over the last.

2. Apparatus for pulling an upper over a last, comprising, incombination, a pair of grippers, each gripper including a main portion,a rigid jaw secured to said main portion, and a pivoted jaw pivotablymounted on said main portion for movement relative to said rigid jaw toadapt to portions of the upper having diiferent thickness, said jaws ofsaid grippers of said pair of grippers having adjacent end pointslocated in the region of the forward tip of the last and other endpoints adapted to be located laterally of the fore part of the last; apair of supports supporting said main portions of said grippers forturning movement about axes passing through said adjacent end points,respectively; and means for turning said grippers on said supportsindependently of each other to operative positions in which said otherend points are adapted to be located adjacent other lateral grippers toform with the same a substantially continuous grip line surrounding thefore part of the last, whereby said grippers are adapted to pull anupper along said continuous grip line over the last.

3. Apparatus for pulling an upper over a last, comprising, incombination, a pair of grippers having adjacent end points located inthe region of the forward tip of the last and other end points adaptedto be located laterally of the fore part of the last; a pair of supportssupporting said grippers for turning movement about axes passing throughsaid adjacent end points, respectively; supporting means supporting saidsupports for movement in the direction of said axes independently ofeach other, and including a pair of levers respectively operativelyconnected to said supports and means for securing said leversindependently of each other whereby the position of said grippers can beadjusted and corrected relative to each other and to the last; and meansfor turning said grippers on said supports independently of each otherto operative positions in which said other end points are adapted to belocated adjacent other lateral grippers to form with the same asubstantially continuous grip line surrounding the fore part of thelast, whereby said grippers are adapted to pull an upper along saidcontinu ous grip line over the last.

4. Apparatus for pulling an upper over a last, comprising, incombination a pair of grippers, each gripper including a main portion, arigid jaw secured to said main portion, and a pivoted jaw pivotablymounted on said main portion for movement relative to said rigid jaw toadapt to portions of the upper having different thickness, said jaws ofsaid grippers of said pair of grippers having adjacent end pointslocated in the region of the forward tip of the last and other endpoints adapted to be located laterally of the fore part of the last,each of said rigid jaws including pins, and each of said pivoted jawsincluding recesses for receiving said pins; a pair of supportssupporting said main portions of said grippers for turning movementabout axes passing through said adjacent end points, respectively; andmeans for turning said grippers on said supports independently of eachother to operative positions in which said other end points are adaptedto be located adjacent other lateral grippers to form with the same asubstantially continous grip line surrounding the fore part of the last,whereby said grippers are adapted to pull an upper along said continuousgrip line over the last.

5. Apparatus for pulling an upper over a last, comprising, incombination, a pair of gripper means, each gripper means including twogripper jaws having directly adjacent inner end points located in theregion of the forward tip of the last and other end points adapted to belocated laterally of the fore part of the last, each gripper meansincluding a part-circular guide part having an axis passing through saidinner end point, a bearing on each guide part, and a pivot shaft in eachbearing supporting the respective gripper jaws for turning novementtoward and away from the last; a pair of supports supporting saidgripper means for turning movement about axes passing through saidadjacent inner end points, respectively, each of said supports includinga part circular guide way having its center coinciding with therespective axis and receiving the respective guide portion of therespective gripper means for guiding the same for movement about therespective axis; and means for turning said gripper means on saidsupports independently of each other to operative positions in whichsaid other end points are adapted to be located adjacent other lateralgrippers to form with the same a substantially continuous grip linesurrounding the fore part of the last, whereby said grippers are adaptedto pull an upper along said continuous grip line over the last.

6. An apparatus as set forth in claim 5, wherein each of said supportsincludes a guide shaft extending substantially parallel to said axes;and a stationary frame having guide ways supporting said guide shaftsfor axial movement, but non-turnable; and means for arresting saidsupports in adjusted positions of said shafts.

7. An apparatus as set forth in claim 6, and including spring meansbetween said shafts and said frame; and threaded adjusting means foradjusting the positions of said guide shafts against the actions of saidspring means.

8. An apparatus as set forth in claim 7, wherein said guide shaftsinclude flanges at the ends thereof, one of said flanges of each guideshaft being engaged by said spring means; a turnable member engaging theother flange of each guide shaft, a pair of levers respectivelyconnected to said turnable members and being turnable for independentlyadjusting the positions of said shafts and of said grippers; and meanson said frame for securing the ends of said levers in a plurality ofindependently adjusted positions.

9. An apparatus as set forth in claim 8, wherein each of said levers ismounted on the respective turnable means for turning movement about aturning axis transverse to the axis of said turnable means; and whereinsaid frame means includes two arcuate rows of catch means for arrestingsaid levers, respectively, said levers being moved into engagement withsaid catch means by turning movement about said turning axes thereof.

10. An apparatus as set forth in claim 9, and including hydraulicoperating means for moving said supports, said turnable means, saidlevers and said grippers apart from each other; and spring means formoving the same toward each other, said levers being disengaged fromsaid catch means when moving apart; and spring means for urging saidlevers and said turnable means to turn to a normal position with saidgripper means when released from said catch means.

11. Apparatus for pulling an upper over a last, com prising, incombination, a pair of adjacent grippers having directly adjacentclosely spaced end points located in a plane in the region of theforward tip of the last and confronting the same and other end pointsadapted to be located laterally of the fore part of the last; a pair ofsupports supporting said grippers for turning movement about axestransverse to said plane passing through said adjacent end points,respectively; hydraulic means for moving said supports and said grippersapart from each other so that said adjacent end points are fartherspaced from the longitudinal plane of symmetry of the last; and meansfor turning said grippers on said supports independently of each otherabout the respective axes to operative positions in which said other endpoints are adapted to be located adjacent other lateral grippers to formwith the same a substantially continuous grip line surrounding the forepart of the last, while said inner end points remain in the sameposition whereby said grippers are adapted to pull an upper along saidcontinuous grip line over the last.

12. Apparatus for pulling an upper over a last, comprising, incombination, a pair of grippers having adjacent end points located inthe region of the forward tip of the last and other end points adaptedto be located laterally of the fore part of the last; operating meansfor opening and closing said grippers; a pair of supports supportingsaid grippers for turning movement about axes passing through saidadjacent end points, respectively; means for turning said grippers onsaid supports independently of each other to operative positions inwhich said other end points are adapted to be located adjacent otherlateral grippers to form With the same a substantially continuous gripline surrounding the fore part of the last, whereby said grippers areadapted to pull an upper along said continuous grip line over the last;wiper means movable transverse to said axes and over the last forputting the upper over the last; and means operatively connecting saidwiper means with said operating means for operation of said grippermeans to open said grippers during movement of said wiper means over thelast.

13. An apparatus for pulling an upper over a last, comprising, incombination, a pair of adjacent toe grippers having directly adjacentclosely spaced inner end points adapted to be located in a plane in theregion of the forward tip of the last and confronting the same, andouter end points adapted to be located laterally of the fore part of thelast; means for supporting said grippers, respectively for turningmovement about a pair of axes transverse to said plane and passingthrough said inner end points, respectively; and means for adjustingeach of said grippers on said supporting means so as to locate saidgrippers to form a substantially continuous grip line extending alongthe fore part of the last while said inner end points remain in the sameposition whereby said grippers are adapted to pull an upper along saidcontinuous grip line uniformly over the last.

14. An apparatus for pulling an upper over a last, comprising, incombination, a pair of adjacent toe grippers having directly adjacentclosely spaced inner end points adapted to be located in a plane in theregion of the forward tip of the last and confronting the same, andouter end points adapted to be located laterally of the fore part of thelast, each gripper having a part-circular guide portion having itscenter of curvature aligned with said inner end point thereof; a pair ofsupports supporting said grippers, respectively for turning movementabout a pair of axes transverse to said plane and passing through saidinner end points, respectively, each of said supports including apart-circular guide element having its center coinciding with therespective axis, said guide elements slidably engaging said guideportions of said grippers, respectively, for guiding said grippers forturning movement about the respective axes; and means for adjusting eachof said grippers on the respective support so as to locate said grippersto form a substantially continuous grip line extending along the forepart of the last while said inner end points remain in the same positionwhereby said grippers are adapted to pull an upper along said continuousgrip line uniformly over the last.

15. An apparatus as set forth in claim l4 wherein each of said grippersis mounted on the respective support for adjustment in a directiontransverse to said plane.

16. An apparatus as set forth in claim 14 and including a pair of guideshafts extending transverse to said plane and parallel to said axes andbeing secured to said supports; and a pair of bearing means supportingsaid guide shaft for longitudinal movement parallel to said axes; andmeans for moving said guide shaft with said supports, respectively, insaid bearing means in one direction; and resilient means biasing saidguide shafts to move opposite to said one direction.

17. An apparatus as set forth in claim 14 wherein each of said supportsincludes a cylinder, and a piston mounted in said cylinder; wherein eachof said grippers includes an upper jaw fixedly mounted on said cylinderand a lower jaw pivotally mounted on said piston; wiper means movabletransverse to said axes and adapted to move over the last for puttingthe upper over the last; control valve means for controlling the flow ofan operating fluid to said cylinders; and means operatively connectingsaid Wiper means with said control valve means so that the lattereffects opening of said grippers during movement of said wiper meansover the last.

18. An apparatus as set forth in claim 14 wherein each of said supportsincludes a cylinder, and a piston mounted in said cylinder; and whereineach of said grippers includes an upper jaw fixedly mounted on saidcylinder and a lower jaw pivotally mounted on said piston.

19. An apparatus as set forth in claim 18 and including means formounting each of said cylinders for movement transverse to said planeand parallel to said axes.

20. An apparatus 'as set forth in claim 18 wherein each 0 of saidsupports includes a part including said guide portion; and wherein eachof said cylinders is mounted on one of said parts, respectively, forpivotal movement about an axis parallel to said plane.

21. An apparatus as set forth in claim 14 and including a pair ofturnable supporting means respectively supporting said supports forturning movement independently of each other about a common axisextending parallel to said plane; a pair of manually operated turnablelevers re spectively connected to said supporting means for turning thesame with said supports and grippers independently of each other; andmeans for arresting said levers independently of each other in adjustedturned positions.

22. An apparatus as set forth in claim 21; and including a pair ofhydraulic means for holding said levers in arrested positions; and apair of spring means for urging said levers to positions released bysaid arresting means.

23. An appartus as set forth in claim 22 and including wiper meansmovable transverse to said axes and adapted to move over the last forputting the upper over the last, said wiper means being operativelyconnected to said hydraulic means to effect release of said levers atthe end of a wiping operation so that said spring means move said leversto said released positions.

References Cited in the tile of this patent UNITED STATES PATENTS

